Issue #3696: Error parsing arguments on OpenBSD <= 4.4 and Cygwin.
Patch by Amaury Forgeot d'Arc, reviewed by me.
diff --git a/configure.in b/configure.in
index b8a4575..bc91c07 100644
--- a/configure.in
+++ b/configure.in
@@ -3571,6 +3571,27 @@
#endif
])
+AC_MSG_CHECKING(for broken mbstowcs)
+AC_TRY_RUN([
+#include<stdlib.h>
+int main() {
+ size_t len = -1;
+ const char *str = "text";
+ len = mbstowcs(NULL, str, 0);
+ return (len != 4);
+}
+],
+ac_cv_broken_mbstowcs=no,
+ac_cv_broken_mbstowcs=yes,
+ac_cv_broken_mbstowcs=no)
+AC_MSG_RESULT($ac_cv_broken_mbstowcs)
+if test "$ac_cv_broken_mbstowcs" = yes
+then
+ AC_DEFINE(HAVE_BROKEN_MBSTOWCS, 1,
+ [Define if mbstowcs(NULL, "text", 0) does not return the number of
+ wide chars that would be converted.])
+fi
+
AC_SUBST(THREADHEADERS)
for h in `(cd $srcdir;echo Python/thread_*.h)`